Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fe8ef3e0737ce0…

MALICIOUS

PDF

137.4 KB Created: 2021-07-03 10:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 58f511e78744c452a495fa6c349a891d SHA-1: 5816d7cd30f833543659f04d5ae58b7a35601400 SHA-256: 08fe8ef3e0737ce0b8c07bf8cc7c2307f8f6bc38823f5453bc2ea22bb3c89260
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PRC/3D content is unusual for a typical document and may be used to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=50+ml+of+hydrogen+diffuses+through+a+small+hole PDF link annotation
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/adec672bf8e9c2a1a34f9638db24c936/webejuvot.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/q8srgho2m63arqlikuqd070nmd/97089659645.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3i6bcckgh6apu3hsk154gbpbi4/63687527284.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/7212713850.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/zozobejujopokutove.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/dagagabidefokobewosusomav.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/warikutegezogowawix.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210617_030152.pdfIn PDF document text
    • http://amandamaitland.com/images/file/sixup.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/mukimeni.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b9aa68b6a---jijepedadewaseluxeru.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c6d687598728632c981508cb0a15f5d2/rukumikagitabaj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d39d418e7---xefufiv.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/67947309797.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/72055900509.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f33695a46c---31985949296.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/vikujajubog.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/konujabidawesunu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/rafobuvuje.pdfIn PDF document text
    • https://termoformat.md/img/files/wavovopezudufavonoxo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160907fca805d2---ruxasexutoka.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cef1849ab81---70797928113.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/21044325875.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001addc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5EE 21144 bytes
SHA-256: e0315aa3408f37d400b292b5dee1745badf5cab224f8d5eec3377d1e3e741cba
font_02_sfnt_off0001fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE00 11176 bytes
SHA-256: fd2fab0564f287a3c107db37b11a1b62d04966b8823600472e2e35d4293c1e73

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